WhatsApp Scales Up Security with Rust-Powered Media Checks
WhatsApp deployed a Rust-based media library across billions of devices, replacing 160k lines of C++ with 90k lines of Rust to boost memory-safety and performance. Sparked by the Stagefright vulnerability, the rollout used fuzzing and tests to ensure compatibility, and introduced Kaleidoscope checks to flag dangerous, non-conformant, or spoofed files. The effort spans Android, iOS, Mac, Web, wearables, and more—the largest Rust deployment on client-side platforms—and signals broader Rust adoption for defense-in-depth security.
